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Newton's Law

Explain why Newton's First Law and the Law of Conversation of Momentum are essentially saying the same thing in different ways. Why is it useful to have these two ways of saying it?

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The first law Newton states that in the absence of external force, the body will be in its original position (in motion or rest).
i.e., if, F = o => m*dv/dt = 0 ......(1)

The Law of Conversation of Momentum states that in the ...

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The answer is given with short explanations.